Gamma-ray Burst 070531

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:11:02 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     280958,   Seg_Num: 0
GRB_RA:            6.678d {+00h 26m 43s} (J2000),
                   6.791d {+00h 27m 10s} (current),
                   5.930d {+00h 23m 43s} (1950)
GRB_DEC:         +74.304d {+74d 18' 14"} (J2000),
                 +74.345d {+74d 20' 41"} (current),
                 +74.027d {+74d 01' 37"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       20036 [cnts]    Image_Peak=493 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   302     E_range: 25-100 keV
BKG_INTEN:       173029 [cnts]
BKG_TIME:        7758.00 SOD {02:09:18.00} UT
BKG_DUR:         40 [sec]
GRB_DATE:        14251 TJD;   151 DOY;   07/05/31
GRB_TIME:        7817.52 SOD {02:10:17.52} UT
GRB_PHI:         -175.47 [deg]
GRB_THETA:        44.14 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.07 [sigma]
IMAGE_SIGNIF:    10.24 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +2  +5  +0  +0 -48  +1 
SUN_POSTN:        67.60d {+04h 30m 23s}  +21.84d {+21d 50' 27"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.16d {+15h 40m 40s}  -24.54d {-24d 32' 16"}
MOON_DIST:       124.26 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.23, 11.51 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       56.88, 60.55 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 111.99,20.45 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:12:44 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.538d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.213d {+74d 12' 48"} (J2000)
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  7945.52 SOD {02:12:25.52} UT,   128.0 [sec] since BAT Trigger Time
COUNTS:          11    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:13:58 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     280958,   Seg_Num: 0
GRB_RA:            6.678d {+00h 26m 43s} (J2000),
                   6.791d {+00h 27m 10s} (current),
                   5.930d {+00h 23m 43s} (1950)
GRB_DEC:         +74.304d {+74d 18' 14"} (J2000),
                 +74.345d {+74d 20' 41"} (current),
                 +74.027d {+74d 01' 37"} (1950)
GRB_DATE:        14251 TJD;   151 DOY;   07/05/31
GRB_TIME:        7817.52 SOD {02:10:17.52} UT
TRIGGER_INDEX:   302
GRB_PHI:         -175.47 [deg]
GRB_THETA:        44.14 [deg]
DELTA_TIME:      -31.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.07 [sigma]
IMAGE_SIGNIF:    10.24 [sigma]
LC_URL:          sw00280958000msb.lc
SUN_POSTN:        67.60d {+04h 30m 23s}  +21.84d {+21d 50' 28"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.19d {+15h 40m 46s}  -24.54d {-24d 32' 38"}
MOON_DIST:       124.26 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.23, 11.51 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       56.88, 60.55 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 111.99,20.45 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:15:24 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.539d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.213d {+74d 12' 48"} (J2000)
POINT_ROLL:      112.277d
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  7948.78 SOD {02:12:28.78} UT,   131.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.790
N_STARS:         142
X_OFFSET:        129 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           1088 [pixels]
Y_MAX:           959 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00280958000msufc0131.fits
SUN_POSTN:        67.60d {+04h 30m 24s}  +21.84d {+21d 50' 28"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.20d {+15h 40m 49s}  -24.55d {-24d 32' 49"}
MOON_DIST:       124.28 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.18, 11.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.68, 60.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:15:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.539d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.213d {+74d 12' 48"} (J2000)
POINT_ROLL:      112.277d
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  7948.78 SOD {02:12:28.78} UT,   131.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.790
N_STARS:         142
X_OFFSET:        129 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           1088 [pixels]
Y_MAX:           959 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00280958000msufc0131.fits
SUN_POSTN:        67.60d {+04h 30m 24s}  +21.84d {+21d 50' 28"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.21d {+15h 40m 50s}  -24.55d {-24d 32' 53"}
MOON_DIST:       124.28 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.18, 11.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.68, 60.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:16:47 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.539d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.213d {+74d 12' 48"} (J2000)
ROLL:            112.277d
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  7948.78 SOD {02:12:28.78} UT,   131.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     202270350
X_OFFSET:        448 [pixels]
Y_OFFSET:        319 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       608
Y_GRB_POS:       479
BINNING_INDEX:   1
IM_URL:          sw00280958000msuni0131.fits
SUN_POSTN:        67.60d {+04h 30m 24s}  +21.84d {+21d 50' 29"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.22d {+15h 40m 52s}  -24.55d {-24d 33' 00"}
MOON_DIST:       124.28 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.18, 11.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.68, 60.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:17:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.539d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.213d {+74d 12' 48"} (J2000)
ROLL:            112.277d
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  7948.78 SOD {02:12:28.78} UT,   131.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     202270350
X_OFFSET:        448 [pixels]
Y_OFFSET:        319 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       608
Y_GRB_POS:       479
BINNING_INDEX:   1
IM_URL:          sw00280958000msuni0131.fits
SUN_POSTN:        67.60d {+04h 30m 24s}  +21.84d {+21d 50' 29"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.22d {+15h 40m 53s}  -24.55d {-24d 33' 03"}
MOON_DIST:       124.28 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.18, 11.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.68, 60.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:26:50 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.539d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.212d {+74d 12' 42"} (J2000)
POINT_ROLL:      112.276d
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  8054.36 SOD {02:14:14.36} UT,   236.8 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        3.410
N_STARS:         190
X_OFFSET:        129 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           1088 [pixels]
Y_MAX:           959 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00280958000msufc0236.fits
SUN_POSTN:        67.61d {+04h 30m 26s}  +21.84d {+21d 50' 32"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.31d {+15h 41m 14s}  -24.57d {-24d 34' 16"}
MOON_DIST:       124.28 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.18, 11.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.68, 60.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:27:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.539d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.212d {+74d 12' 42"} (J2000)
POINT_ROLL:      112.276d
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  8054.36 SOD {02:14:14.36} UT,   236.8 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        3.410
N_STARS:         190
X_OFFSET:        129 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           1088 [pixels]
Y_MAX:           959 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00280958000msufc0236.fits
SUN_POSTN:        67.61d {+04h 30m 26s}  +21.84d {+21d 50' 33"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.31d {+15h 41m 15s}  -24.57d {-24d 34' 20"}
MOON_DIST:       124.28 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.18, 11.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.68, 60.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:28:14 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.539d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.212d {+74d 12' 42"} (J2000)
ROLL:            112.276d
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  8054.36 SOD {02:14:14.36} UT,   236.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     202270456
X_OFFSET:        448 [pixels]
Y_OFFSET:        319 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       608
Y_GRB_POS:       479
BINNING_INDEX:   1
IM_URL:          sw00280958000msuni0236.fits
SUN_POSTN:        67.61d {+04h 30m 26s}  +21.84d {+21d 50' 33"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.32d {+15h 41m 17s}  -24.57d {-24d 34' 26"}
MOON_DIST:       124.28 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.18, 11.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.68, 60.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:28:38 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.539d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.212d {+74d 12' 42"} (J2000)
ROLL:            112.276d
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  8054.36 SOD {02:14:14.36} UT,   236.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     202270456
X_OFFSET:        448 [pixels]
Y_OFFSET:        319 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       608
Y_GRB_POS:       479
BINNING_INDEX:   1
IM_URL:          sw00280958000msuni0236.fits
SUN_POSTN:        67.61d {+04h 30m 26s}  +21.84d {+21d 50' 33"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.32d {+15h 41m 18s}  -24.58d {-24d 34' 29"}
MOON_DIST:       124.28 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.18, 11.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.68, 60.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:29:10 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.538d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.212d {+74d 12' 42"} (J2000)
POINT_ROLL:      112.275d
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  8683.30 SOD {02:24:43.30} UT,   865.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.426
N_STARS:         137
X_OFFSET:        129 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           1088 [pixels]
Y_MAX:           959 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00280958000msufc0865.fits
SUN_POSTN:        67.61d {+04h 30m 26s}  +21.84d {+21d 50' 33"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.33d {+15h 41m 19s}  -24.58d {-24d 34' 34"}
MOON_DIST:       124.28 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.18, 11.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.68, 60.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:29:37 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.538d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.212d {+74d 12' 42"} (J2000)
POINT_ROLL:      112.275d
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  8683.30 SOD {02:24:43.30} UT,   865.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.426
N_STARS:         137
X_OFFSET:        129 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           1088 [pixels]
Y_MAX:           959 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00280958000msufc0865.fits
SUN_POSTN:        67.61d {+04h 30m 26s}  +21.84d {+21d 50' 33"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.33d {+15h 41m 20s}  -24.58d {-24d 34' 37"}
MOON_DIST:       124.28 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.18, 11.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.68, 60.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:30:37 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.538d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.212d {+74d 12' 42"} (J2000)
ROLL:            112.275d
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  8683.30 SOD {02:24:43.30} UT,   865.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     202271085
X_OFFSET:        448 [pixels]
Y_OFFSET:        319 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       608
Y_GRB_POS:       479
BINNING_INDEX:   1
IM_URL:          sw00280958000msuni0865.fits
SUN_POSTN:        67.61d {+04h 30m 26s}  +21.84d {+21d 50' 34"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.34d {+15h 41m 22s}  -24.58d {-24d 34' 44"}
MOON_DIST:       124.28 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.18, 11.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.68, 60.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:30:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.538d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.212d {+74d 12' 42"} (J2000)
ROLL:            112.275d
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  8683.30 SOD {02:24:43.30} UT,   865.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     202271085
X_OFFSET:        448 [pixels]
Y_OFFSET:        319 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       608
Y_GRB_POS:       479
BINNING_INDEX:   1
IM_URL:          sw00280958000msuni0865.fits
SUN_POSTN:        67.61d {+04h 30m 26s}  +21.84d {+21d 50' 34"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.34d {+15h 41m 22s}  -24.58d {-24d 34' 46"}
MOON_DIST:       124.28 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.18, 11.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.68, 60.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:31:11 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.538d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.212d {+74d 12' 42"} (J2000)
POINT_ROLL:      112.274d
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  8788.88 SOD {02:26:28.88} UT,   971.4 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.664
N_STARS:         118
X_OFFSET:        129 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           1088 [pixels]
Y_MAX:           959 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00280958000msufc0971.fits
SUN_POSTN:        67.61d {+04h 30m 26s}  +21.84d {+21d 50' 34"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.35d {+15h 41m 23s}  -24.58d {-24d 34' 49"}
MOON_DIST:       124.28 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.18, 11.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.68, 60.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:31:39 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.538d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.212d {+74d 12' 42"} (J2000)
POINT_ROLL:      112.274d
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  8788.88 SOD {02:26:28.88} UT,   971.4 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.664
N_STARS:         118
X_OFFSET:        129 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           1088 [pixels]
Y_MAX:           959 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00280958000msufc0971.fits
SUN_POSTN:        67.61d {+04h 30m 26s}  +21.84d {+21d 50' 34"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.35d {+15h 41m 24s}  -24.58d {-24d 34' 52"}
MOON_DIST:       124.28 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.18, 11.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.68, 60.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #6475
C. B. Markwardt (GSFC/UMD), L. M. Barbier (NASA/GSFC), S. D. Barthelmy (GSFC), M. M. Chester (PSU), N. Gehrels (NASA/GSFC), S. D. Hunsberger (PSU), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL) and M. Stamatikos (NASA/ORAU) report on behalf of the Swift Team:
At 02:10:17 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 070531 (trigger=280958). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 6.678, +74.304 which is
```
   RA(J2000)  =  00h 26m 43s
   Dec(J2000) = +74d 18' 14"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single FRED-like peak with a duration of about 20 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~2 sec after the trigger.
The XRT began taking data at 02:12:25 UT, 128 seconds after the BAT trigger. The XRT on-board centroid algorithm did not find a source in the image and no prompt position is available. We are waiting for down-linked data to detect and determine a position for the source.
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 131 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of the BAT error circle. The typical 3-sigma upper limit has been about 18.5 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the BAT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.38.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:32:33 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.538d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.212d {+74d 12' 42"} (J2000)
ROLL:            112.274d
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  8788.88 SOD {02:26:28.88} UT,   971.4 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     202271190
X_OFFSET:        448 [pixels]
Y_OFFSET:        319 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       608
Y_GRB_POS:       479
BINNING_INDEX:   1
IM_URL:          sw00280958000msuni0971.fits
SUN_POSTN:        67.61d {+04h 30m 27s}  +21.84d {+21d 50' 35"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.36d {+15h 41m 26s}  -24.58d {-24d 35' 00"}
MOON_DIST:       124.28 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.18, 11.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.68, 60.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 02:32:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     280958,   Seg_Num: 0
POINT_RA:          6.538d {+00h 26m 09s} (J2000)
POINT_DEC:       +74.212d {+74d 12' 42"} (J2000)
ROLL:            112.274d
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  8788.88 SOD {02:26:28.88} UT,   971.4 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     202271190
X_OFFSET:        448 [pixels]
Y_OFFSET:        319 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       608
Y_GRB_POS:       479
BINNING_INDEX:   1
IM_URL:          sw00280958000msuni0971.fits
SUN_POSTN:        67.61d {+04h 30m 27s}  +21.84d {+21d 50' 35"}
SUN_DIST:         61.29 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      235.36d {+15h 41m 27s}  -24.58d {-24d 35' 02"}
MOON_DIST:       124.28 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.18, 11.43 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       56.68, 60.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #6476
A. Gomboc (Univ. of Ljubljana), R.J. Smith, C.G. Mundell, A. Melandri, I.A. Steele, D. Carter, A. Monfardini, C.J. Mottram, S. Kobayashi, D. Bersier, M. Burgdorf (Liverpool JMU) and C. Guidorzi (Uni-Bicocca/INAF-OAB) report:
The 2-m Liverpool Telescope robotically followed up GRB 070531 (Swift trigger 280958, GCN 6475 Markwardt et al.) and started observing the field at 3.7 min after the trigger time with the RINGO polarimeter. Photometric observations started at 11.9 min after the trigger time.
In first images we do not detect any new object down to:
```
Filter        t_mid  (min from GRB)     Tot_Exp (s)      Lim
-------------------------------------------------------------------
r'                 13.2                  60              18.2
i'                 19.0                 120              17.9
------------------------------------------------------------------
```
Magnitudes were calibrated vs R2 and I mag from the USNOB1 catalogue. Further analysis is ongoing.
GCN Circular #6477
K.L. Page (U. Leicester) & C.B. Markwardt (GSFC/UMD) report on behalf of the Swift-XRT team:
We have analysed the first orbit of data (930 seconds in Photon Counting mode) for GRB 070531 (trigger number 280958) and find an uncatalogued, fading X-ray source at a position of RA, Dec 6.73989, 74.3131, which is
```
RA(J2000)  =  00 26 57.57
Dec(J2000) = +74 18 47.0
```
with an uncertainty of 3.7 arcsec (radius, 90% containment). This is 69 arcsec from the on-board BAT position (GCN Circ. 6475, Markwardt et al.), within the BAT error circle.
This circular is an official product of the Swift-XRT team.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 31 May 07 06:09:18 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     280958,   Seg_Num: 0
GRB_RA:            6.7398d {+00h 26m 57.5s} (J2000),
                   6.8522d {+00h 27m 24.5s} (current),
                   5.9905d {+00h 23m 57.7s} (1950)
GRB_DEC:         +74.3131d {+74d 18' 47.1"} (J2000),
                 +74.3541d {+74d 21' 14.6"} (current),
                 +74.0364d {+74d 02' 11.0"} (1950)
GRB_ERROR:       3.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       4.30e-11 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  14251 TJD;   151 DOY;   07/05/31
IMG_START_TIME:  7956.00 SOD {02:12:36.00} UT,   138.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.19 261.35 242.66
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        67.76d {+04h 31m 03s}  +21.86d {+21d 51' 53"}
SUN_DIST:         61.30 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      237.32d {+15h 49m 17s}  -25.03d {-25d 01' 31"}
MOON_DIST:       124.26 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      121.25, 11.52 [deg] galactic lon,lat of the burst
ECL_COORDS:       56.91, 60.54 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values are not valid.   
COMMENTS:        This position is ground-generated

GCN Circular #6478
A. de Ugarte Postigo, A.J. Castro-Tirado (IAA-CSIC, Granada), J. Benko (Konkoly Observatory, Hungary) and A. de la Nuez (IAC Tenerife), on behalf of a larger collaboration, report:
"We have observed the field of GRB 070531 (Markwardt et al., GCNC 6475) in I-band using the IAC80 telescope at Iza=F1a Observatory (Spain) starting at 04:01 UT (1.85 hours after the burst). A combined image of 3960 s does not show any source within the XRT error box (Page et al. GCNC 6477). The image is significantly deeper than the DSS2.
The image is posted at:
http://www.iaa.es/~deugarte/GRBs/070531/GRB070531.gif
This message can be quoted
GCN Circular #6479
G. Sato (GSFC/ISAS), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 070531 (trigger #280958) (Markwardt, et al., GCN Circ. 6475). The BAT ground-calculated position is RA, Dec = 6.722, 74.316 deg which is
```
   RA(J2000)  = 00h 26m 53.3s 
   Dec(J2000) = 74d 18' 58" 
```
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 44%.
The mask-weighted light curve shows a singe FRED peak starting at T_0 with a long weak tail out to at least T+150 sec. There is a 20-sec gap in the data -- the weak emission is back to background by T+170 sec. T90 (15-350 keV) is 44 +- 2 sec (estimated error including systematics).
The time-averaged spectrum from T-2.4 to T+44.6 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.41 +- 0.20. The fluence in the 15-150 keV band is 1.1 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+1.08 sec in the 15-150 keV band is 1.0 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #6480
A. de Ugarte Postigo, A.J. Castro-Tirado (IAA-CSIC, Granada), C. Gonzalez (IAC Tenerife), A. Cabrera (GTC Project Office) on behalf of a larger collaboration, report:
"We have observed the field of GRB 070531 (Markwardt et al., GCNC 6475) in J, H and K-bands using the 2.5mNOT (+NOTCAM) Roque de los Muchachos Observatory (Spain) starting at 04:17 UT (2.11 hours after the burst). We do not detect any source in the XRT error box (Page et al. GCNC 6477) down to J~19.5 (3-sigma)."
This message can be quoted
GCN Circular #6481
M. De Pasquale (MSSL/UCL) and C. B. Markwardt (GSFC/UMD) report, on the behalf of Swift UVOT team:
The Swift Ultraviolet/Optical telescope (UVOT) began its White filter finding chart exposure of GRB070531 (Markwardt et al., GCN circ. 6475) 135 seconds after the trigger. No optical afterglow is detected inside the refined XRT error circle (Page et al., GCN circ. 6477), in the initial V and White filter exposures and the summed exposures in all filters.
In the following table, we report the 3 sigma upper limits for any optical afterglow .
Filter Time (s) Exp(s) 3sigma UL Mag
White 132-231 98 19.5
White 132-966 207 19.9
V 238-637 393 19.2
V 238-1111 524 19.3
B 716-726 10 18.2
U 692-4845 76 18.9
UW1 668-4803 236 19.2
UM2 643-4598 236 19.5
UW2 745-764 20 17.8
No correction has been made for the Galactic reddening toward the burst, E(B-V)=0.38
GCN Report 62.1
GCN_Report 62.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_62_1.pdf by C.B. Markwardt at CRESST/U.Md/NASA/GSFC titled: "Final Swift observations of GRB 070531"

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Jochen Greiner, last update: 02-Jun-2007 [Disclaimer]